MEEN 315-501 Fall 2010 Problem Set 05 Due: Wednesday October 6, 2010, 13:50 - NO LATE ASSIGNMENTS ACCEPTED! SOLUTIONS WILL BE POSTED IMMEDIATELY. Problem 01 R-134a undergoes a polytropic process. The initial and final states of the refrigerant are fixed by p 1 =200 kPa, T 1 = -10°C and p 2 =1000 kPa, T 2 =50°C, respectively. Calculate the work and heat transfer for the process, each in kJ/kg of refrigerant. Problem 02 R134a is compressed with no heat transfer in a piston cylinder assembly from 30 psi, 20°F to 160 psi. The mass of the refrigerant is 0.04 # m . For the refrigerant as the system, W = - 0.56 Btu. Kinetic and potential energy effects are negligible. Determine the final temperature of the water in the tank in °F. Problem 03 A rigid well-insulated tank contains a two-phase mixture consisting of 0.005 ft 3 of saturated liquid water and 1.2 ft 3 of saturated water vapor, initially at 14.7 psi. A paddle wheel stirs the mixture until only saturated vapor remains in the tank. Kinetic and potential energy effects are negligible.
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